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Looking at the relationship between IQ and success statistically we do find reasonable correlations in most endeavors. It's no surprise that IQ is strongly correlated with academic performance but personality traits such as Conscientiousness
are also strongly correlated independent of intelligence. In fact a study of 140 eighth grade students found Self-Discipline outdoes IQ in predicting academic success.
IQ is correlated with success in creative fields but is better predicted by Divergent Thinking tests. A high IQ helps in many endeavors but is not required and often not the most important trait to possess.